Re: Single digit SD\'s - 95% of the time???
I must say that it is mostly the effect of such a great design that yields such low sd's, but I will share the case prep that went into my brass.
First, I bought 100 pieces of Lapua brass. After that, I ran them all over a .001" oversized neck mandrel. Then trimmed them all to same length. Then I squared the case heads. Then I turned the necks for a .265" neck and uniformed the primer pockets and deburred the flash holes. Contrary to popular belief, the flash holes on this brass were not perfect. WHile there was no outstanding burrs, they had a flat side on some that would have affected ignition. I also like to put a slight bevel on the flash hole because I believe it helps "funnel" the flash through to touch a wider base of the powder column.
Anyway, after all this was done, I weighed them and found no more than .4 of a grain variation in all 100 pieces!
After that, I just trickled in the exact amount of Varget and RL15 and seated the 105 AMAX into the jam and went shooting.
On a side note, I chose the AMAX because of it's better explosion on varmints over the Sierra's or Bergers and I managed to test the expansion factor on a crow yesterday and the results were, well, gory!
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Is there a difference between the 6BR Imp and the 6Dasher"?
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There are many versions of the improved, but the Dasher and the main improved reamer are the same. My gunsmith actually built a reamer for the 6 and 7 br imp 10 years before Dowling got credit for it, and he calls it a 6 br tejas.
If it's not far, it's boring.